/**
 * @author mrdoob / http://mrdoob.com/
 */

THREE.PointerLockControls = function ( camera ) {
    
        var scope = this;
    
        camera.rotation.set( 0, 0, 0 );
    
        var pitchObject = new THREE.Object3D();
        pitchObject.add( camera );
    
        var yawObject = new THREE.Object3D();
        yawObject.position.y = 10;
        yawObject.add( pitchObject );
    
        var PI_2 = Math.PI / 2;
    
        var onMouseMove = function ( event ) {
    
            if ( scope.enabled === false ) return;
    
            var movementX = event.movementX || event.mozMovementX || event.webkitMovementX || 0;
            var movementY = event.movementY || event.mozMovementY || event.webkitMovementY || 0;
    
            yawObject.rotation.y -= movementX * 0.002;
            pitchObject.rotation.x -= movementY * 0.002;
    
            pitchObject.rotation.x = Math.max( - PI_2, Math.min( PI_2, pitchObject.rotation.x ) );
    
        };
    
        this.dispose = function() {
    
            document.removeEventListener( 'mousemove', onMouseMove, false );
    
        };
    
        document.addEventListener( 'mousemove', onMouseMove, false );
    
        this.enabled = false;
    
        this.getObject = function () {
    
            return yawObject;
    
        };
    
        this.getDirection = function() {
    
            // assumes the camera itself is not rotated
    
            var direction = new THREE.Vector3( 0, 0, - 1 );
            var rotation = new THREE.Euler( 0, 0, 0, "YXZ" );
    
            return function( v ) {
    
                rotation.set( pitchObject.rotation.x, yawObject.rotation.y, 0 );
    
                v.copy( direction ).applyEuler( rotation );
    
                return v;
    
            };
    
        }();
    
};